Looks like someone forgot to code a space after the version...
209.67.146.1XX
Mozilla/5.0 (compatible; heritrix/1.14.3.r6601+http://www.yp.com)
robots.txt? Yes
Fake ref/log spam? Yes; the hit site's URL
rDNS is massive Savvis (Irvine Jouve Data Management):
209.67.0.0/16
From older notes, here's a Savvis (Lakewood Search Initiatives) IP bedfellow using a fake UA:
209.67.146.1XX
Mozilla/5.0
robots.txt? NO
[edited by: Ocean10000 at 5:25 am (utc) on Apr 21, 2010]
[edit reason] Obscured IPs [/edit]